Strapping machine and packaging method for the strapping machine

Abstract

The present application belongs to the technical field of strapping machines, and particularly refers to a strapping machine and strapping method thereof. The strapping machine includes a frame, a strap storage mechanism, a looping mechanism, a tightening mechanism, a welding mechanism, and a strap cutting mechanism; the tightening mechanism includes a movable assembly, a detection roller, a detection bracket, a damping component, and a trigger device; the movable assembly first retracts the strap in the strap retracting process, then drives the detection bracket through the strap in tension, and the reel of the strap storage mechanism switches to the rotating state from the locked state, achieving the scheme of strap storage after strap retracting; when the detection bracket moves, the trigger device indirectly or directly controls the reel to release the strap.

What is claimed is: 
     
         1 . A strapping machine, comprising:
 a frame,   a strap storage mechanism, which is used to store the straps and supply the straps to the looping mechanism when needed;   a looping mechanism, which is used to move the straps along a circular track and form a loop connected end to end;   a tightening mechanism, which is used to tighten the straps in reverse and tightly bind the loop formed by the straps on the product to be tied;   a welding mechanism, which is used to weld the head and tail ends of the loop into one piece; and   a strap cutting mechanism, which is used to cut off the straps that are still connected outside the loop;   wherein the strap storage mechanism comprises:   a reel assembly, which is used to install a reel; a locking device is provided on the reel assembly; the locking device controls the reel to be in a locked state or a rotatable state; when the reel is in the locked state, the reel cannot rotate; and when the reel is in the rotatable state, the reel supplies the straps;   a plurality of fixed rollers, which are installed on one side of the strap storage mechanism; and the fixed rollers are used for winding the straps; and   a plurality of movable rollers, which are installed on the other side of the strap storage mechanism; the movable rollers are used for winding the straps; and the fixed rollers and the movable rollers coordinate to form a strap storage area;   the retracting mechanism comprises:   a movable assembly, which can be movable mounted on the frame; the movable rollers are mounted on the movable assembly; the movable assembly can move between a first position and a second position; when the movable assembly moves to the first position, the movable rollers move away from the fixed rollers for strap storage; and when the movable assembly moves to the second position, the movable rollers approach the fixed rollers for strap conveying;   a detection roller, which is used for winding the strap; and the detection roller is installed on the detection bracket;   a detection bracket, which is rotatably or movably mounted on the frame; and the detection bracket is provided with a damping component that provides a certain resistance to the detection bracket; and   a trigger device, which is used to obtain the movement of the detection bracket; and when the detection bracket moves, the trigger device indirectly or directly controls the locking device, and the locking device makes the reel rotate.   
     
     
         2 . A strapping machine of  claim 1 , wherein the damping component is an electromagnetic damper with resistance adjustable, and a gear is installed on the output shaft of the electromagnetic damper;
 the detection bracket is a swing arm, the middle part of the swing arm is rotatably mounted on the frame, the lower end of the swing arm is installed with the detection roller, and a tooth surface portion is provided on the upper end of the swing arm; and the tooth surface portion meshes with the gear; and   a sensing part is arranged on one side of the swing arm; and the trigger device is a sensor provided on the frame, and the sensor detects the movement of the sensing part.   
     
     
         3 . A strapping machine of  claim 1 , wherein the plurality of fixed rollers and the plurality of movable rollers are arranged vertically; the fixed rollers and the movable rollers are staggered with each other in the horizontal direction; and the detection roller is provided in the same column as the fixed rollers;
 or, the plurality of fixed rollers and the plurality of movable rollers are arranged horizontally; the fixed rollers and the movable rollers are staggered with each other in the vertical direction; and the detection roller is provided in the same row as the fixed rollers.   
     
     
         4 . A strapping machine of  claim 1 , wherein a slide rail, a synchronous strap assembly, and a drive motor are installed on the frame; and the conveying direction of the synchronous strap assembly is parallel to the slide rail;
 the movable assembly is mounted on the slide rail, and the slide rail guides the movable assembly to move between the first position and the second position; and   one side of the movable assembly is fixedly connected to the synchronous strap assembly; and the drive motor drives the movable assembly through the synchronous strap assembly.   
     
     
         5 . A strapping machine of  claim 4 , wherein the movable assembly comprises a first movable bracket and a second movable bracket; the first movable bracket and the second movable bracket are both mounted on the slide rail; and the first movable bracket and the second moving bracket are of split structures;
 the movable rollers are installed on the front side of the first movable bracket, a rope is installed on the rear side of the first movable bracket, and the other end of the rope passes through the steering roller and is hung with a counterweight;   the second movable bracket is fixedly connected to the synchronous strap assembly; and   the second movable bracket is located between the first movable bracket and the fixed rollers.   
     
     
         6 . A strapping machine of  claim 5 , wherein a photoelectric sensor chip is provided on the first movable bracket, and a photoelectric sensor is provided on the frame; and when the first movable bracket is located at the first position, the photoelectric sensor chip triggers the photoelectric sensor. 
     
     
         7 . A strapping machine of  claim 5 , wherein a shock pad is provided between the first movable bracket and the second movable bracket, and the shock pad is fixed on the first movable bracket or the second movable bracket; and
 the locking device on the reel assembly is an electromagnetic brake.   
     
     
         8 . A strapping method for the strapping machine, wherein the method is based on the strapping machine of  claim 1 , and the specific steps comprise:
 step (1), in the initial state, the strap storage mechanism stores the straps normally, and the reel is in a locked state;   step (2), perform the strap conveying action; the strap conveying roller assembly clamps the strap to convey forward, the force of the strap in the tension state is transmitted to the movable rollers, and the movable rollers and the movable assembly move from the first position to the second position; and after the movable rollers move a certain distance, the strap conveying process is completed;   step (3), compress the front end of the strap;   step (4), perform the strap retracting action: the strap conveying roller assembly releases the strap, and the movable assembly moves to the first position; during the movement, the movable rollers retract the strap to the inside of the strap storage mechanism, and the strap is gradually tightened; when the tension of the strap gradually increases to a set value, the detection roller is driven by the strap, and the detection roller drives the detection bracket; the trigger device on the frame detects the movement of the detection bracket; and the trigger device indirectly or directly controls the locking device, and the locking device makes the reel in a rotatable state;   step (5), perform the strap storage action: the strap conveying roller assembly and/or the rear cutter clamps the strap, the movable assembly continues to move toward the first position, and the reel rotates and supplies the strap to the inside of the strap storage mechanism until the strap storage is completed; and   step (6), the strap cutting mechanism completes strap cutting, the welding mechanism completes calendering; and the strapping is completed.   
     
     
         9 . A strapping method for the strapping machine of  claim 8 , wherein the movable assembly comprises a first movable bracket and a second movable bracket; the first movable bracket and the second movable bracket are both mounted on the slide rail; and the front side of the first movable bracket is installed with the movable rollers, and the rear side of the first movable bracket is installed with a rope and a counterweight;
 the second movable bracket is fixedly connected to the synchronous strap assembly, and the drive motor drives the synchronous strap assembly and the second movable bracket;   in the step (1), the first movable bracket and the second movable bracket are separated in the initial state, the first movable bracket is located at the first position under the action of the counterweight, and the second movable bracket is located at the second position;   in the step (2), the movable rollers and the first movable bracket overcome the gravity of the counterweight, the movable rollers and the first movable bracket both move a certain distance to the second position, and the strap conveying is completed;   in the step (4), the first movable bracket moves to the first position under the action of the counterweight; the second movable bracket moves to the first position under the action of the synchronous strap assembly and the drive motor; when the first movable bracket moves to a certain extent to the first position, the strap is in a tension state, and the strap excessively conveyed in the strap conveying step has been retracted to the strap storage mechanism;   in the step (5), the second movable bracket continues to move toward the first position and drives the first movable bracket to move toward the first position; the reel rotates to store the strap until the first movable bracket reaches the first position; and when the first movable bracket reaches the first position, the first movable bracket triggers a photoelectric signal;   the drive motor drives the synchronous strap assembly to rotate in the opposite direction according to the photoelectric signal, the second movable bracket moves to the second position and drives the detection bracket to reset; and the locking device locks the reel again; and   when the resetting of the detection bracket is completed, the sensor on the frame is triggered, and the strap is completely stored.   
     
     
         10 . A strapping method for the strapping machine of  claim 9 , wherein in the step (5), the step (6) is performed first and then the step (5) after the strap conveying roller assembly clamps the strap, or, the step (5) and the step (6) are performed simultaneously.